39455-81-7

Basic information

• Product Name: Thulium Oxide
• Synonyms: O3Tm2
• CAS NO: 39455-81-7
• Molecular Formula: Tu2O3
• Molecular Weight: 385.86700
• EINECS: 234-851-6
• Mol File: 39455-81-7.mol
• Article Data: 3

Chemical Properties

• Appearance: Light green cubic crystal
• CAS DataBase Reference: Thulium Oxide(CAS DataBase Reference)
• NIST Chemistry Reference: Thulium Oxide(39455-81-7)
• EPA Substance Registry System: Thulium Oxide(39455-81-7)

Safety Data

• Hazard Codes: Xi:Irritant
• Statements: R36/37/38:
• Safety Statements: S26:; S36:
• Hazardous Substances Data: 39455-81-7(Hazardous Substances Data)

Usage

General Description

Thulium oxide is a chemical compound with the formula Tm2O3, consisting of two thulium atoms bonded to three oxygen atoms. It is a rare-earth oxide that is a pale green solid at room temperature. Thulium oxide is used in specialized glass and ceramic applications, as well as in the production of certain catalysts and catalyst supports. It has also been investigated for its potential use in solid-state lasers, phosphors, and other electronic and magnetic devices. Thulium oxide is considered to be relatively stable and non-toxic, but it should still be handled with care and in accordance with proper safety precautions.

InChI:InChI=1/3O.2Tm/rO3Tm2/c1-4-3-5-2

Upstream product

• 14041-47-5 thulium 
• 80937-33-3 oxygen 
• 10024-97-2 dinitrogen monoxide 

Relevant articles and documents

Temperature-Dependent Rate Constants for the Reactions of Gas-Phase Lanthanides with O2

The reactivity of the gas-phase lanthanide atoms Ln (Ln = La-Yb with the exception of Pm) with O2 is reported. Lanthanide atoms were produced by the photodissociation of [Ln(TMHD)3] and detected by laser-induced fluorescence. For all the lanthanides studied with the exception of Yb, the reaction mechanism is bimolecular abstraction of an oxygen atom. The bimolecular rate constants (in molecule-1 cm3 s-1) are described in Arrhenius form by k[Ce(1G4)] = (3.0 ± 0.4) × 10-10 exp(-3.4 ± 1.3 kJ mol-1/RT); Pr(4I9/2), (3.1 ± 0.7) × 10-10 exp(-5.3 ± 1.5 kJ mol-1/RT); Nd(5I4), (3.6 ± 0.3) × 10-10 exp(-6.2 ± 0.4 kJ mol-1/RT); Sm(7F0), (2.4 ± 0.4) × 10-10 exp(-6.2 ± 1.5 kJ mol-1/RT); Eu(8S7/2), (1.7 ± 0.3) × 10-10 exp(-9.6 ± 0.7 kJ mol-1/RT); Gd(9D2), (2.7 ± 0.3) × 10-10 exp(-5.2 ± 0.8 kJ mol-1/RT); Tb(6H15/2), (3.5 ± 0.6) × 10-10 exp(-7.2 ± 0.8 kJ mol-1/RT); Dy(5I8), (2.8 ± 0.6) × 10-10 exp(-9.1 ± 0.9 kJ mol-1/RT); Ho(4I15/2), (2.4 ± 0.4) × 10-10 exp(-9.4 ± 0.8 kJ mol-1/RT); Er(3H6), (3.0 ± 0.8) × 10-10 exp(-10.6 ± 1.1 kJ mol-1/RT); Tm(2F7/2), (2.9 ± 0.2) × 10-10 exp(-11.1 ± 0.4 kJ mol-1/RT), where the uncertainties represent ±2σ. The reaction barriers are found to correlate to the energy required to promote an electron out of the 6s subshell. The reaction of Yb(1S0) with O2 reacts through a termolecular mechanism. The limiting low-pressure third-order rate constants are described in Arrhenius form by k0[Yb(1S0)] = (2.0 ± 1.3) × 10-28 exp(-9.5 ± 2.8 kJ mol-1/RT) molecule-2 cm6 s-1.

SYNTHESIS OF RARE EARTH MONOXIDES.

The standard Gibbs energy changes for the formulation of an ionic or metallic monoxide from rare earth metal and sesquioxide have been calculated. Under high pressures ionic ytterbium monoxide and lighter rare earth metallic monoxides should be obtained, which is confirmed by experiments in a belt-type apparatus in the range 15-80 kbar and 500-1200 degree C. For Ln equals La, Ce, Pr, Nd, Sm, a face-centered cubic compound is obtained from each reaction. The cell parameters are respectively 5. 144, 5. 089, 5. 031, 4. 994, and 4. 943 plus or minus 0. 005 A. The compounds appear golden yellow with a metallic luster. From chemical analysis and cell parameter consideration it is concluded that these compounds are the rare earth monoxides. For Ln equals Gd, Dy, Tm, no reaction is observed at 50 kbar and 1000 degree C.